通过http客户端发送gzip

Question

我正在以下方式打电话。

      HttpParams httpParameters = new BasicHttpParams();
        int timeoutConnection = 3000;
        HttpConnectionParams.setConnectionTimeout(httpParameters,
                timeoutConnection);
        int timeoutSocket = 5000;
        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);

        DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
        ResponseHandler<String> resonseHandler = new BasicResponseHandler();
        HttpPost postMethod = new HttpPost(url);
        // JSONObject json = new JSONObject();
        // json.put("id", data);
        postMethod.setHeader("Content-Type", "application/json");
        postMethod.setEntity(new ByteArrayEntity(data.getBytes("UTF8")));
        response = httpClient.execute(postMethod, resonseHandler);
        Log.v(LOG_TAG, "Connector response:" + response);

但我想发送 gzip ，我该怎么做？ 我知道我们可以补充一下：

postMethod.setHeader("Content-Encoding", "gzip");

但如何将字符串转换为 gzip 并发送？